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3.3.3 CONGESTION CONTROL

This message is sent by the network or the user to indicate the establishment or termination of flow control on the transmission of USER INFORMATION messages. See Table 3-37.

Table 3-37/Q.931

CONGESTION CONTROL message content

Message type: CONGESTION CONTROL
Significance: local (Note 1)
Direction: both

 

Information element

Reference
(subclause)

Direction

Type

Length

Protocol discriminator

4.2

Both

M

1

Call reference

4.3

Both

M

2-*

Message type

4.4

Both

M

1

Congestion level

4.5

Both

M

1

Cause

4.5

Both

M

4-32

Display

4.5

n ® u

O (Note 2)

(Note 3)

NOTES

1. This message has local significance, but may carry information of global significance.

2. Included if the network provides information that can be presented to the user.

3. The minimum length is 2 octets; the maximum length is network dependent and is either 34 or 82 octets.